66512833 has 2 divisors, whose sum is σ = 66512834. Its totient is φ = 66512832.

The previous prime is 66512819. The next prime is 66512839. The reversal of 66512833 is 33821566.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 46949904 + 19562929 = 6852^2 + 4423^2 .

It is a cyclic number.

It is not a de Polignac number, because 66512833 - 2⁵ = 66512801 is a prime.

It is not a weakly prime, because it can be changed into another prime (66512839) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33256416 + 33256417.

It is an arithmetic number, because the mean of its divisors is an integer number (33256417).

Almost surely, 2^66512833 is an apocalyptic number.

It is an amenable number.

66512833 is a deficient number, since it is larger than the sum of its proper divisors (1).

66512833 is an equidigital number, since it uses as much as digits as its factorization.

66512833 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 25920, while the sum is 34.

The square root of 66512833 is about 8155.5400189074. The cubic root of 66512833 is about 405.1680103620.

The spelling of 66512833 in words is "sixty-six million, five hundred twelve thousand, eight hundred thirty-three".